Magnetic relaxation measurements of (alpha)-Fe2O3 antiferromagnetic particles below 1 K
In this paper we report magnetic relaxation data for antiferromagnetic a-Fe2O3 particles of 5-nm mean diameter in the temperature range 0.1–25 K. The average spin value of these particles S.124 and the uniaxial anisotropy constant D.1.631022 K have been estimated from the experimental values of the...
| Authors: | , , , , , , |
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| Format: | article |
| Status: | Published version |
| Publication Date: | 2002 |
| Country: | España |
| Institution: | Varias* (Consorci de Biblioteques Universitáries de Catalunya, Centre de Serveis Científics i Acadèmics de Catalunya) |
| Repository: | Recercat. Dipósit de la Recerca de Catalunya |
| OAI Identifier: | oai:recercat.cat:2445/10874 |
| Online Access: | https://hdl.handle.net/2445/10874 |
| Access Level: | Open access |
| Keyword: | Relaxació magnètica Propietats magnètiques Magnetic properties Magnetic relaxation |
| Summary: | In this paper we report magnetic relaxation data for antiferromagnetic a-Fe2O3 particles of 5-nm mean diameter in the temperature range 0.1–25 K. The average spin value of these particles S.124 and the uniaxial anisotropy constant D.1.631022 K have been estimated from the experimental values of the blocking temperature and anisotropy field. The observed plateau in the magnetic viscosity from 3 K down to 100 mK agrees with the occurrence of spin tunneling from the ground state SZ5S. However, the scaling M vs T ln(n0t) is broken below 5 K, suggesting the occurrence of tunneling from excited states below this temperature. |
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